Differential change-speed gear.



J. COOPER.

DIFFERENTIAL CHANGE SPEED GEAR.

APPLlcmoN man Dzc.2o. lars.

1,279,658. Patentedseptgzl, 1918.

I ject.V of the King y io! `tion for the use of automobiles.

JOHN COOPER, or CHICAGO', ILLINOIS.

DIFFERENTIAL CHANGE-SPEED GEAR.

Specification of Letters Patent;

Patented sept.24,1o1s.

Application led December 30, 1915. Serial No. 67,711.

To all whom it 'may concern:

Be it known thatl. Joux Coorizn, a suhof England, residing at (chicago. in the county of Cook and State of Illinois. haveinvented certain new and useful Improvements in 'Differential Change- Spccd Gears, of which' the-following is a specification.

My invention relates to change gears and has particular vreference to their construc- The objects the invent-ion are simplification of confs'trnctiom` economy of space..y and the -in-', "troduction of certaindetail improvements in 'the interest of sai'ety andireduccd com plexity, all as hereinafter described in detail,

.illustrated in the accompanying provided with a usual diiferential gear andis4 for that purpose representing in drawing, and' more articularly pointed out in the appended c aims.

Inthe drawing Figure 1 isanelevationof a change gear embodying myA invention, the gear casing being partly broken away and partly in section.

Fig. '2 is a section taken substantially on line X'-X of Fig; 1.- i

In the-several views Q represents the gear casing having hubs 3 and 4 thereon contain` 'ing hall bearings 5 and t3 for a driven shaft 'i' which may represent the axleof a self propelling vehicle. A similar hub 8 and a bearing support 9 projecting from an interior wall lof the casing support, by any suitable arrangement. ball bearings 10 and 11 for'a driving shaft 1'?. driven by any of the usual `forms of engine. The shaft T is divided in two parts with meeting squared ends gage rectangular openings and 1G that. mesh with bevel gears 1T and 18 on pins or shafts 1.) and '20 the ends of whit-,hare mountedin a spacer sleeve 2l and case 2'2.l-which has hub or sleeve the gear l portions Q3 and 24 `which normally rotate with the sleeve or hub, portions and 24 and the case by the `four bevel gears inentioned. The casing 22 is substantially the hub portion ofa multiple face gear on which is a pluralityl of rings ot gears tti. '27 and 28. The gear 26 is in mesh 27 with a gear 30, gear 31, each loose different speeds. with a gear29.' he gear andthe gear Q8 with a on the engine shaft 12, rotatably, and held clutch member V13 and 14 which eni in bevel gears 15 i which is rotablyconnccted l the present instance three shown. in Fig. 1 and against longitudinal movement along said shaft by a screw 32 which engagesl an annular slot 33 formed in the shaft. Provis ion for reversing' the movement through the medium of the slo-wspeedy gearBl, is made by means of a gear34,.also` normali' loose on` the shaft,V which is in mesh wit i' a gear 35 keyed to a shaft 36 to which'is also keyed a gear 37 which' is in mesh with thegear 38. One end of the shaft 36is mounted in a' bearin recess 38 in the casing and the other end o said shaft has' its bearing in a lugor post 39 which may be cast integral with the casing 2.

As shown in Fig. l provision is made for keying either one of the gears on the shaft 12 to said shaft and Vto prevent the accidental keying of two gears to the shaft at-t-he saine time. In the verticalfaces-facing each other of tlie gears 31 and 34 are` clutch slots 40 and 41 into either of which a clutch member. or other suitableY interlocking device, is moved by meansof a lever 42 fulcrumed at 43 on the casing and in an opening therein. A'similar lever 44 is fiilc'ruined at 4.5 and moves another similar clutch member into either recesses 46 in the wheel 30 or similar recesses 47 in the wheel '29. 48 and 49 represent the teeth or lugs projecting from opposite sides of one of the clutch members and 50 and. 51 represent corre` spending teeth or lugs which project oppo# sitely on the other clutch member. The. moved by the lever`42'is designated as 52 and the member moved by the lever 44V is 'designated by the numeral 5'2. ln each of these 4clutch members 5'?. and 52 is a Apcripl'ieral slot 53 that isengaged by a pair of lugs 54 that extend'toward eachother oii a usual form of sliding clutch fork composed of arms and 56 constituting thc. load-end of each lever.

On the lever 42 is an arm 57 that carries a disk 58 in which is a slot 59 that is curved on the axis 43 anda slot 6() curved on `the axis 45.` On the lever the path of' the slot (30 when the lever 44 is operated and which must be in line with the slot59 when the lever 42 is moved to key either of its Hence neither lever can be moved:` except when its companion is in neutral position accidental connection4 of two bevel' gears automatically prevented. The'lever 42 is 44 isa similar arm. '(31 that carries a pm 62 which must movein with the shaft.- 12 is:`

geaiiwheelsto the shaft 12.

end of the lever 42'.

l connected with the operators hanl by'nieans of a rod or other suitabe' f connection 63 pivoted A similar r= d- 65 -is coupled at 66 to the lever 44. Th Safety ing arms 57 and 61 and their partv is not limited to the exact positions in wl ich theyy are shown or to the partcula?4 two ,tevers 42 for the clutch members .52 and 52 represeiitatives of exclusive details for this purpose. From the foregoing description it will be seen that the reverse, or back-up, movement. lever 42 is utilized ,to add a third speed to the 'usual two-s eed rovided in variousforms for the di erential gear rear axle, or shaft 7 herein; that the'back-up lever is made automatically interdependent with the forward movement mechanism and lever, and that in this instance there are two fori ward movement levers, the lever 42 being for both forward and backward movement, the forward movement and the reverse move-- ment gears are within the same casing, and, owing `to the arrangement of all loose-on-theshaft gears or'pinions o n one shaft with all' the ring gears fixed ielative to each other,

the casing space occupied by bothforward and backward movement gears is comparatively small. The arrangement herein of having all the ring gears fixed and lall the pinions normally loose also obviates the more clutches are mounted on both shafts 7 and aving thus described 4my invention, I

arrangement represented by the c 'iperatand 44, nor are the'latter as actuating means .orless `complicated lever connections when 12, and also reduces the number of break- ,s able and comparatively inaccessible parte?" e l. 'The combination with .a driving shaft, "of a plurality of beveledpinionsrotatively connected to said shaft, clutch elements 'car-4 ried by said. pinions,- slidablel clutch elements splined lto said shaft'and adapted to be selectively engaged4 with the pinion clutch elements, adriven element, aser-ies of concentric roy element, reversing gears, one ofsaid reversing gears constantly. meshing with one of said concentric? rows of teeth, and the'other with one ofsaidfbeveled pinions, and the other beveled pinions constantly meshing with the said concentric rows of teeth.

2.' ThecOmbinat-ion with aV driving shaft, of a driven shaft, a plurality of change speed gears for rotating said driven shaft at different ratesv of speed in one direction relative to the driving shaft, coupling mechanisn'is for connecting said driving shaft with the.

different speed gears, reverse movement sof gear teeth on said drivengears, and means for operatively connecting. and disconnecting same with and from said `driving shaft, a. pair of levers for actuating the driving shaft connection mechanisms for all of said change movement gears, and means rendering one 0f saidl levers inoperative bythe operation of i 'i I "o the other lever:4

3. The combination ith -a shaftgof; areversing gear pinion and three ring gear, pinions havin ,elutchelements thereon and be-I ying gear pinion orone of said ring gear' pinions, a similar clutch member similarly arranged between the remaining twopinions,z levers.

operatively connected with said clutch mem-- speed gears and reversey rotata le'on said, shaft, fa, clutch' mem.'A ber slidably'splined to said'shaft and adapt-v as 'ed to be engaged with either said-reversing bers andhaving arms with overlapping `parts thereon, one of said arms having intersecting that is movable in. said'slots. l. i y

In testimony' whereof .I have hereunto signed my name.v I

JOHN Goeree.

slots therein and thisJ otherarni having a pin 

